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From: Yong Wu <yong.wu@mediatek.com>
To: Rob Herring <robh+dt@kernel.org>, Matthias Brugger
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Subject: [PATCH v4 1/7] dt-bindings: reserved-memory: Add mediatek,dynamic-restricted-region
Date: Fri, 12 Jan 2024 17:20:08 +0800
Message-ID: <20240112092014.23999-2-yong.wu@mediatek.com>
In-Reply-To: <20240112092014.23999-1-yong.wu@mediatek.com>
References: <20240112092014.23999-1-yong.wu@mediatek.com>
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Add a binding for describing the dynamic restricted reserved memory range.
The memory range also will be defined in the TEE firmware. It means the TEE
will be configured with the same address/size that is being set in this
DT node. Regarding to the detail TEE command, Please search
MTK_TZCMD_SECMEM_ZALLOC and MTK_TZCMD_SECMEM_FREE.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 .../mediatek,dynamic-restricted-region.yaml   | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml

diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml
new file mode 100644
index 000000000000..5cbe3a5637fa
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/mediatek,dynamic-restricted-region.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Dynamic Reserved Region
+
+description:
+  A memory region that can dynamically transition as a whole between
+  secure and non-secure states. This memory will be protected by OP-TEE
+  when allocations are active and unprotected otherwise.
+
+maintainers:
+  - Yong Wu <yong.wu@mediatek.com>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: mediatek,dynamic-restricted-region
+
+required:
+  - compatible
+  - reg
+  - reusable
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        reserved-memory@80000000 {
+            compatible = "mediatek,dynamic-restricted-region";
+            reg = <0x80000000 0x18000000>;
+            reusable;
+        };
+    };
-- 
2.25.1